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Os calcis fractures: analysis of interobserver variability in using Sanders classification.
Journal of Foot and Ankle Surgery 2003 January
The os calcis is the most frequently fractured tarsal bone. In 1992 Sanders developed a classification system based on coronal and axial computed tomography (CT) scans of the calcaneus. This classification is the one used most frequently today in treatment decision making and reporting of results. The objective of this study was to assess the degree of interobserver variability in using this classification system. Thirty CTs of calcaneal fractures were chosen randomly from the past 5 years in 2 tertiary care centers. The CTs were reviewed by 3 orthopedic surgeons and one senior orthopedic resident who classified the fractures according to Sanders' classification. The results were first tabulated and analyzed by using a weighted kappa test including the subcategories. The weighted kappa value achieved was.56, with a 95% confidence interval of.45-.67. The subcategories of the classification were then further combined and a second weighted kappa test was performed to assess agreement between general classes. The weighted kappa value achieved was.48, with a 95% confidence interval of 0.37-0.59. We concluded that Sanders' classification system did prove to achieve moderate agreement among users, thus representing a useful classification system.
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